upgrade my website without disturbing current load

Comments

actually my company is taken me to solve linux related problems
so i cant heir any consultant

In that case you have a long manual effort ahead of you. Hopefully you are doing this upgrade on a cloned machine instead of the productions server.

If you are on a clone machine then you can re-clone the original machine and attempt the upgrade operation again from the link I previously provided doing them in increments.

If you are on the production machine then I would go with the plan to backup the tables, remove the original software, install the new version of the software then attempt to append the old data into the new tables.

but i m not getting ezpublish 4.4 from internet
i m only able to download ezpublish 4.5

In this case an international call is justified because you will need to contact the company that sells this product to ask for the 4.4 upgrade scripts, 4.4 installation files or instructions on upgrading from 4.3 to 4.5, you cannot be expected to perform an upgrade on undocumented software As long as it is your job to resolve these issues you must be allowed to use whatever resources are necessary to obtain resolution, if you are a contractor working on this job then you might want to do the call on your personal phone and east the cost personally.

i didnt understand following steps
1)eZ Components:
Enterprise edition includes a version of eZ Components that is tested and certified
with this version of eZ Publish-

The community edition requires the latest stable release of eZ Components.
To install this, you also need PEAR
See http://ez.no/ezcomponents for more information

2)Step 1: Upgrading the distribution files

The easiest way to upgrade the distribution files is to unpack eZ Publish 4.4 to a separate directory and then copy the directories that contain site-specific files from the existing installation. Make sure that you copy the following directories:

If you are using custom extensions, the sub-directories inside the "extension" directory will also have to be copied. However, make sure that you do not overwrite any extensions that are included in eZ Publish, which currently are eZ Online Editor (5.x), eZ OpenOffice.org (2.x) and eZ JSCore (1.x). Note that upgrading the distribution files will overwrite the autoload arrays for extensions. You will need to re-generate the autoload arrays for active extensions later.

See the dedicated upgrade instructions for eZ Flow and Website Interface below.

The updated versions of eZ Flow and Website Interface will also install the following extensions:

*
eZ Website Toolbar
*
eZ Star Rating
*
eZ Google Maps Location

For eZ OE 5.x and eZ JS Core you will need to replace the following rewrite rules when using Virtual Hosts:

For more detailed instructions, see the dedicated eZ OE and eZ JS Core doc pages.
Note: Both admin2 design and webin (ezwebin extension) requires ezjscore extension to be enabled, look here for how to enabling extensions.